Absolutely no idea! I haven't kept an account on my vape spending, but it's definately way less than i was spending on fags.
I spent the the first 18 months building up a stash of juices, got them when they were on offer. The only things i buy now occasionaly, is a top up of my fav juice (again only when on offer, like right now V-Juice 50% off Black Friday deals)..a little bit on coils, here and there...and i've just bought a new VC4S charger and LG batteries from ol' Foggy. I don't need any new mods..i've got more than i need.
So..as a rough estimate....mibbe £10-20 a month? I don't use much juice, about 5ml a day, or thereabouts.
So..yeah..after the initial 'shinyitis' phase..things have settled down cost wise.
I still don't have any money though! There's always something else that needs buying....like this month...a new Telly!
Last month..it was a new camera!
And I can't begin to think how much has gone on my mancave project to date..but that's taking a breather for winter.
Next month.....it'll be Xmas that'll empty my wallet....there's always something isn't there *sighs*.
I was hoping to have a nice little nest egg saved up by now..not a bloody chance!